Gun discharge registering device



Dec. 29, 1942. E. OJALVO I GUN DISCHARGE REGISTERING DEVICE Filed Jan. 13, 1941 atented Dec. 29, 1942 GUN DISCHARGE REGISTERING DEVICE Edmond Ojalvo, New York, N. Y.

Application January 13, 1941, Serial No. 374,200

3 Claims.

This invention relates to gun discharge registering devices, and more particularly to a shot recording meter operatively associated with a gun for indicating the number of times the weapon had been fired since the last setting thereof.

It is primarily within the contemplation of my invention to facilitate the solution of crimes, particularly in cooperation with permit and registration data available to police authorities for ascertaining the identity of persons owning or using firearms. To accomplish this objective I employ, as an element of a gun, a simple mechanism adapted to be actuated upon the firing of the weapon whereby a counter or meter will visibly register each shot as it is fired, thereby indicating the total number of discharges since the last setting of the instrument.

It is a further object of this invention, in the preferred form thereof, to enable the registration or metering mechanism to be actuated by the pressure differential created upon the explosion of the shell.

It is still another object of my invention to enable the aforesaid device to function without in any way affecting the travel of the bullet through the barrel or muzzle of the gun.

Still another object of this invention is to enable the registration mechanism to be readily made either as an integral part of the gun, or as an attachment affixed to it after its completion.

It is also another object of my invention, to enable the mechanism thereof to be conveniently positioned in such manner as not to affect either the sighting of the gun or the balancing thereof.

It is within the further contemplation of this invention to provide means for preventing a tampering with the mechanism thereof, without in any way interfering with its operation.

Other objects, features and advantages will appear from the drawing and the description hereinafter given.

Referring to the drawing,

Figure 1 is an elevation of a gun showing the position of the registering device constituting my invention.

Figure 2 is an enlarged fragmentary longitudinal section of the barrel of the gun showing the position of the essential features of my invention before the discharge of the gun.

Figure 3 is a view similar to Figure 2, showing the position of the parts after the firing thereof.

Figure 4 is a transverse section of Figure 3 taken along line 4-4.

Figure 5 is a transverse section, substantially similar to that of Figure 4, of a modified form of my invention, and

Figure 6 is a fragmentary longitudinal section of Figure 5 taken along line 66.

In the drawing, the barrel ID of gun H contains preferably at the underside thereof the casing l2 containing therein certain of the mochanism comprising my invention. In the form of my invention illustrated, the barrel contains at the bottom thereof the channel l3 communicating with the interior of said casing l2. D rectly below said channel is the lever 14 operatively connected through suitable linkage to a conventional counter or registering device 15. A detailed description of such device is not herein given, inasmuch as it is well known in the art. In the construction illustrated the said lever I4 is pivotally mounted at [6, the forward end I! of the lever being operatively connected to the device l5 whereby upon successive pivotal movements of said lever [4, the said device IE will successively register, and display through the window [8, numbers that will be readily visible. In the preferred arrangement, the rear portion of the lever l4 supports a pin I9 extending into the channel I3, the uppermost edge 20 of said pin being preferably a trifle below the uppermost edge 2| of the channel, the pin having at all times a portion spaced from the walls of the channel.

In the operation of this mechanism. the lever I4 is normally in a neutral position, such as that indicated in Figure 2. After the gun is fir d and the bullet is in the position shown in Figure 3 beyond the said channel l3, any pressure differential between the interior of barrel Ill and the interior of casing I2 will cause a flow of air or gas through said channel l3, the said pin l9 being sufiiciently thin to permit such a flow. Under normal operating conditions the expanding hot gases behind the bullet 22 will pass through said channel l3 and impinge upon the upper surface of lever M to cause a pivotal movement of the lever, an operative actuation of the device l5 and a registration of the next successive number which will be visible through window l8. It is of course understood that the lever can be so arranged that upon an upward or counter-clockwise movement thereof it will actuate the device IS, an arrangement which would be necessary only in the event the speed of the outflowing gases in the barrel will cause a depression therein. In either event, an aperture 23 is provided in the casing l2 at some suitable point so as to permit communication with the atmosphere.

It is apparent from the construction hereinabove described that there is no obstruction whatsoever to the passage of the bullet 22. Neither need there be any substantial structural change made in the weapon, inasmuch as the registering device, although coactively associated with the barrel, is otherwise disconnected with any other operative part of the gun. If it is desired to make this device a built-in part of the gun, the casing [El can be constructed integral with the barrel. If on the other hand it is desired to affix the device to a completed gun, it is apparent that all that need be done is to drill a hole I3 within the barrel, and by any suitable means attach to the barrel the casing 12 with the assembled mechanism therein.

It w'll be further observed that the entire casing i2 is positioned below the barrel and not in the line of sight. Furthermore, it is centrally located along the medial portion of the barrel, so as not to adversely affect the balance of the weapon. This is made possible by the fact that the lever I4 is longitudinally disposed with res ect to the barrel ID,

The pin I 9 which is supported by the lever H5 will prevent a wire or other instrument from being ins rted through the barrel Ifl into the channel I3, in an attempt to tamper with the lever. Should such a wire actually be brought into contact wi h the pin l9, it will merely cause a depression thereof and an operative movem rit of the lever to cause a registration of the next succeeding number. very purpose of tampering with the device, as it w"l actuall register a shot rather than prevent thregistration thereof.

In Figures 5 and 6 is shown a modified form of my invent on in which the barrel 24 contains two diametr cally opposed apertures 25 and 26 in the lateral sides thereof, these apertures being in communicat on with channels 27 extending circumferentially around the lower portion of the barrel and communicating through channel 28 with the interior of casing 29. The said channels 2'! are preferably formed by making the lower portion of barrel 24 slightly heavier than the upper portion. The meter actuating mechanism is essentially the same as in the form hereinabove referred to, the lever 30 being operatively associated with the registering device 3!.

In this last-referred-to form of my invention, any pressure differential between the interior of barrel 2 and casing 29 will be transmitted This will defeat the as it would be exceedingly difiicult for a wire or other instrument to be forced through either of the apertures 25 and 26 to ultimately reach the lever 30.

It is of course understood that the various embodiments above described and shown in the drawing are illustrative of my invention and not employed by way of limitation, inasmuch as numerous changes and modifications may be made within the scope of the appended claims Without departing from the spirit of this invention.

What I claim is:

1. A discharge indicating device in combination with the barrel of a gun, comprising a casing associated with the barrel, an aperture communicating between the interior of the barrel and the casing, a counter device within the casing, and movable means within the casing and operatively connected to said counter device and having a portion thereof adjacent and in the path of said aperture, whereby said movable means will be actuated by a flow of gases through said aperture upon the discharge of the gun and the counter device accordingly operatively actuated, said movable means supporting a pin extending into the said aperture and spaced from the Wall thereof a sufiicient amount to permit the flow of gases therepast.

2. A discharge indicating device in combination with the barrel of a gun, comprising a cas ing positioned on the underside of the barrel, two laterally enclosed channels extending circumferentially around the lower portion of the barrel and communicating with the interior of said casing, said channels communicating with the interior of said barrel through two oppositely disposed apertures therein, a counter device within the casing, and pressure responsive means within said casing and operatively connected to said counter device, said means being responsive to a pressure differential induced between the casing and barrel by the operative discharge of the gun, whereby the counter device is operatively actuated.

3. A discharge indicating device in combination with the barrel of a gun, comprising a casing positioned on the underside of the barrel, two laterally enclosed channels extending circumferentially around the lower portion of the barrel and joined at the underside thereof to form a single aperture communicating with the interior of the casing, said two channels communicating with the interior of the barrel through two diametrically oppositely disposed apertures therein, a counter device within the casing, a lever pivotally mounted within the casing and extending longitudinally of the barrel, one arm of the lever being operatively connected to the counter device and the other arm being disposed adjacent said aperture and in the path thereof, whereby the lever will be movably actuated by a flow of gases through said aperture upon the discharge of the gun and the counter a device accordingly operatively actuated.

EDMOND OJ ALVO. 

